GPU QA Improvements and fixes, fix deterministic mode, remove broken MI100 workaround

[davidrohr]

No description provided.

[github-actions]

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[alibuild]

Error while checking build/O2/fullCI_slc9 for 04066d6 at 2025-12-10 22:30:

## sw/BUILD/O2-latest/log
/sw/SOURCES/O2/14909-slc9_x86-64/0/GPU/GPUTracking/Global/GPUChainTracking.cxx:478:105: error: 'tasksAutomatic' is not a member of 'o2::gpu::GPUQA'
/sw/SOURCES/O2/14909-slc9_x86-64/0/GPU/GPUTracking/Global/GPUChainTracking.cxx:693:102: error: 'tasksAutomatic' is not a member of 'o2::gpu::GPUQA'
make[2]: *** [GPU/GPUTracking/CMakeFiles/GPUTracking.dir/build.make:643: GPU/GPUTracking/CMakeFiles/GPUTracking.dir/Global/GPUChainTracking.cxx.o] Error 1
make[2]: *** Waiting for unfinished jobs....
make[1]: *** [CMakeFiles/Makefile2:320: GPU/GPUTracking/CMakeFiles/GPUTracking.dir/all] Error 2
make: *** [Makefile:136: all] Error 2

Full log here.